KAP-1, a novel corepressor for the highly conserved KRAB repression domain

  • Friedman J
  • Fredericks W
  • Jensen D
 et al. 
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The KRAB repression domain is one of the most widely distributed transcriptional effector domains yet identified, but its mechanism of repression is unknown. We have cloned a corepressor, KAP-1, which associates with the KRAB domain but not with KRAB mutants that have lost repression activity. KAP-1 can enhance KRAB-mediated repression and is a repressor when directly tethered to DNA. KAP-1 contains a RING finger, B boxes, and a PHD finger; the RING-B1-B2 structure is required for KRAB binding and corepression. We propose that KAP-1 may be a universal corepressor for the large family of KRAB domain-containing transcription factors.

Author-supplied keywords

  • Corepressor
  • KRAB domain
  • RING finger
  • zinc-finger

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  • Josh R. Friedman

  • William J. Fredericks

  • David E. Jensen

  • David W. Speicher

  • Xiao Pei Huang

  • Eric G. Neilson

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